components/Buttons/examples/ButtonsCustomFontViewController.swift

// Copyright 2017-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import UIKit

import MaterialComponents.MaterialButtons
import MaterialComponents.MaterialContainerScheme
import MaterialComponents.MaterialButtons_Theming

class ButtonsCustomFontViewController: UIViewController {

  var containerScheme = MDCContainerScheme()

  @objc class func catalogMetadata() -> [String: Any] {
    return [
      "breadcrumbs": ["Buttons", "Buttons (Custom Font)"],
      "primaryDemo": false,
      "presentable": false,
    ]
  }

  override func viewDidLoad() {
    super.viewDidLoad()

    // Define our design data
    if let customFont = UIFont(name:"Zapfino", size:14.0) {
      let typographyScheme = MDCTypographyScheme()
      typographyScheme.button = customFont
    }

    // Apply our design data using the Material themers
    view.backgroundColor = containerScheme.colorScheme.backgroundColor
    let flatButtonStatic = MDCButton()
    flatButtonStatic.applyContainedTheme(withScheme: containerScheme)
    flatButtonStatic.setTitle("Static", for: UIControl.State())
    flatButtonStatic.sizeToFit()
    flatButtonStatic.translatesAutoresizingMaskIntoConstraints = false
    flatButtonStatic.addTarget(self, action: #selector(tap), for: .touchUpInside)
    view.addSubview(flatButtonStatic)

    let flatButtonDynamic = MDCButton()
    flatButtonDynamic.applyContainedTheme(withScheme: containerScheme)
    flatButtonDynamic.setTitle("Dynamic", for: UIControl.State())
    flatButtonDynamic.sizeToFit()
    flatButtonDynamic.translatesAutoresizingMaskIntoConstraints = false
    flatButtonDynamic.addTarget(self, action: #selector(tap), for: .touchUpInside)
    flatButtonDynamic.mdc_adjustsFontForContentSizeCategory = true
    view.addSubview(flatButtonDynamic)

    let views = [
      "flatStatic": flatButtonStatic,
      "flatDynamic": flatButtonDynamic
    ]

    centerView(view: flatButtonDynamic, onView: self.view)

    view.addConstraints(
      NSLayoutConstraint.constraints(withVisualFormat: "V:[flatStatic]-40-[flatDynamic]",
                                     options: .alignAllCenterX,
                                     metrics: nil,
                                     views: views))
  }

  // MARK: Private

  func centerView(view: UIView, onView: UIView) {
    onView.addConstraint(NSLayoutConstraint(
      item: view,
      attribute: .centerX,
      relatedBy: .equal,
      toItem: onView,
      attribute: .centerX,
      multiplier: 1.0,
      constant: 0.0))

    onView.addConstraint(NSLayoutConstraint(
      item: view,
      attribute: .centerY,
      relatedBy: .equal,
      toItem: onView,
      attribute: .centerY,
      multiplier: 1.0,
      constant: 0.0))
  }

  @objc func tap(_ sender: Any) {
    print("\(type(of: sender)) was tapped.")
  }

}